Automatic-telephone system



- mmwz Feb- 1, 1927 ,1. wscxs AUTOMATIC TELEPHONE sYsTw Original Filed March a, 1.920 4 Sheets-Swat 1 Uhrz Zrzliuks i 1,616,402 J.- WICKS AUTOMATIC TELEPHONE SYSTEM Feb. 1, 1927.

Original Filed March 8 1920 4 Sheets-Sheet 2 gmhr klhcks E UF I 1 616,402 Feb. 1, 1927. J. WICKS,

AUTOMATIC TELEPHONE SYSTEM Ori inal Filed March 8 1920 -4 Sheets-Sheeii-i J. WICKS Feb. 1, 1927. 1,616,402

AUTOMATIC TELEPHONE SYSTEM Original Filed March 8 1920 4 Sheets-Sheet 4 Tl mks Patented Feb. 1, 1927.

UNITED STATES PATENT OFFICE.

JOHN WICKS, OF OAK PARK, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

AUTOMATIC ELECTRIC INC, OF CHICAGO, ILLINOIS, A.

WARE.

CORPORATION OF DELA- AUTOMATIC-TELEPHON E SYSTEM.

Application filed, March 8, 1920, Serial No. 364,069. Renewed July 17, 1926.

My inventipn relates in general to automatic telephone systems but is concerned more particularly with methods ofhandli-ng long distance calls in such systems, and the object of the invention, in general, is to provide a new and improved toll service trunking system for connecting local subscribers in automatic exchanges with long distance lines, either as calling or called subscribers.

Toll service trunkin systems of the above character have been known before, and I wish to'refer to U. S. Patent #li315,444,

, issued to me on Sept. 9, 1919', whic 1 shows 1 and fully describes a modern system of toll service trunks, and also to my pending applications, Serial -Numbers 155,640 and 346,323, filed March 19, 1917, and December 20, 1919, respectively, which show various improvements in such systems. The present a plicat-ion is directed to the same general 0 ects, and includes a number of improvements, one of which lies in the provision of circuit arrangements in a toll service trunking system, whereby a toll operator can sue- 2 cessfully handle calls from subscribers? stations which are equipped with the well known coin collecting devices which are commonly known as Gray paystations, shown and described in the U. S. patent to Forsberg, #1343219, granted November 5, 1912.

I have devised complete circuits which enable the toll operator to collect or refund deposited coins as desired, and which at the same time give the operator lamp supervision 3 over the collecting and refunding operations according to standard practice.

In addition to the above I have found it advisable to make many circuit changes,

and have made numerous other improvements not especially connected with the paystation feature, all of which will be pointed f out and fully described in the detailed specification which follows. reference being bad to the accompanying drawings forming a I part thereof.

The subject matter claimed in the instant application is confined to that part of the system having to do with the control and operation of paystation mechanism, while so the other features of novelty disclosed are being claimed in a division of this application bearing Serial No. 531,076, filed January 23, 1922.

In the drawings, comprising Figs. 1, 2,

nation of the circuit improvements in which the real invention lies, and which will now he proceeded with.

For this purpose it will be assumed that the subscriber at'substati'on A, Fig. 4, has placed a long distance call with a toll recording operator and that the ticket containing the usual data concernin the desired connection has been forwarded to the toll operator having the cord circuit 0, Fig. 1, for completion. Having extended a connection to the desired distant exchange over one of her toll lines, as for exam la the toll line which terminates in jack J, ig. 1, and having ordered the proper local line to be connected up in that exchange, the toll operator will next proceed to call the subscriber at substation A by way of the toll lng key K- being thrown to'listening posi' tion. Upon the insertion of the plug in the jack J a circuit is completed for relay 20 as follows: ground at G, winding of relay 20, sleeve of jack J, sleeve of plug, contact springs of key K, the impulse springs of the call device S, and the resistance 4 to battery. Upon the closure of the above circuit relay 20 is energized and completes a circuit for the slow acting relay21, which upon energizing in turn connects ground G to the release trunk conductor 58 extending to the toll selectorE. A branch of this conductor extends to the busy lamp L and its multiplcs in other positions (not shown), and the lamps are lighted to indicate that the trunk line associated therewith is busy. When relay 20 energizes it also closes a control or operating circuit for the toll selector E which may be traced 'as follows: ground at G winding of the line relay 51, resting contact of armature 63 and the said armature, armature 30 and its resting contact, armature 29 and its resting contact, conductor 60, armature23 and its workin contact, and the resistance 24 to battery. pon the closure of the above circuit-the line relay 51 is energized and closes the circuit of the slow acting release relay 52. Upon energizing, the latter relay prepares the selector switch for operation in its vertical movement in the usual manner, and at its u per armature connects ground to the re ease trunk conductor 58, as it is desirable to have this conductor grounded locally While the switch is being operated.

The toll operator will now operate her calling device S in accordance with the tele phone number of the subscriber at substation A. When the calling device dial-is operated in accordance with the first digit of the number, a series of interruptions is produced in the circuit of the relay 20. Responsive to these interruptions in its circuit, relay 20 .deenergizes momentarily a correspondin number of times, and produces a series 0 interru tions in the circuit of the line relay 51 of t e toll selector E. The line relay 51 is therefore deenergized a plurality of times corresponding to the digit called, and at each deener ization sends a current impulse throng the slow acting series relay 53 and the vertical magnet 56 to battery. By the operation of the vertical magnet the switch shaft is raised step by step until the wipers 7 0'7 3, inclusive, stand opposite the horizontal I level of bank contacts which are terminals of trunk lines leading to the desired thousand group. The slow acting series relay 53 is energized in series with the vertical magnet, maintaining its armature continuously attached during the vertical operation of the switch, and closes a circuit for the stepping relay 54. The steppin relay 54 is therefore energized, and when t e olf normal springs are shifted at the first u ward movement of the switch shaft, esta lishes a locking circuit for itself by way of the off normal springs 59. At the end of the vertical movement of the switch the slow acting relay 53 is deenergizcd and completes a circuit for the rotary magnet 57 which extends from the grounded conductor 58 by way of the armature of stepping relay 54 and its working contact, the off normal springs 59, and contact springs controlled by the ar-n'iaturc of relay 53 to the said rotary magnet 57. The rotary magnet is accordingly energized and advances the wipers -73, inclusive, into engagement with the first set of bank contacts in the level opposite which they were raised. Near the end of its stroke the rotary magnet breaks its own circuit and also the circuit of the stepping relay 54, which is accordingly deenergized to open the circuit of the rotary magnet at another point. Both the rotary magnet 57 and the stepping rcla y 54 having deenergized, the operation now depends upon whcther' the test contact with which the test wiper 71 is in engagement is busy or is not busy. If this test contact is 'busy, it will have a ground potential upon it tinues' as long as the test wiper 71 continues to engage grounded test contacts. As soon as the first non-grounded test contact is reached, which we will assume to be the test contact 75 associated with the trunk line comprising conductors 78, 79, and 80, the stepping relay 54 will not again be energized, and the rotary movement of the switch will cease. The switching relay 50, which here-- tofore has been short circuited, is now energized over the following circuit: grounded conductor 58, winding of the switching relay 50, off normal springs 59 and the winding of the stepping relay 54 to battery. Relay 50 is of such high resistance that the stepping relay 54 is not energized. Upon energizing, relay 50 connects the grounded conductor 58 to the test wiper 71 in order to make the multiples of test contact 75 busy to other switches, opens another point in the circuit of the release magnet 55, and at its armature 63, disconnects the control or operating circuit from the line relay 51 and ex tends it by way of the working contact of the said armature 63, conductor 66, wiper 72, bank contact 76. conductor 79. winding of the marginal relav 109 of the repeater D, Fig. 2, armature 137 and its resting con tact, and the winding of the line relay 104 to ground. Upon the extension of the control circuit as above described, the line relay 104 is energized and completes a circuit for the slow acting release relay 105. Upon energizing, relay 105 connects ground at its armature 129 to the release trunk conductor 144 thereby closing a circuit for rclav 102 which upon attracting its armaturcs I20 and 121 closes the upper and lower talking circuit conductors through the repeater. It should be mentioned that the relay 109, which is included in the circuit of the line relay 104, is shunted by a non-inductive rcsistance and is marginally adjusted so that it will not energize at the present time.

I The talking strands of the operators cord circuit have now been extended by way of the springs of jack J, the conductors 61 and 62, wipers and 73, bank contacts 74 and '77, conductors 78 and 80, left hand windings of the repeating coil R, armatures 116 and 117 of relay and their respective resting contacts, and resistances 112 and 114 to battery and ground, respectively. It follows that the bridged supervisory relay 3 at the cord circuit 0 will be energized to light the supervisory lamp L. It may be mentioned at this time that after the relays 51 and 52 of the toll selector E have deenergized, the switching relay 50 is maintained energized over the release trunk conductor 58 coming from the armature 25 of the slow acting relay 21, which relay is associated with the jack J. This method of establishing a holding circuit by extending the ground forward instead of backward is contrary to the usual practice, but is adopted here becauseyin certain circumstances the selector E and repeater D may be located in different exchanges, in which case it is desirable to eliminate the release trunk conductor extending from the repeater back to the selector.

WVhen the line.relay 104 of the repeater D was energized, as previously ex lained, a control or operating circuit exten' ing to the line relay 151 of the toll second selector F, Fig. 3, was completed as follows: ground at G working contact of armature 126 and the said armature conductor 143, armature and its resting contact, and the winding of the line relay 151 to battery. Upon the closure of the above circuit the line relay 1-51 is energized, and completes a circuit for the slow actin release relay 152 in the usual manner. U pon energizing, relay 152 grounds the release trunk conductor 144 locally at'its upper armature, and at its lower armature prepares the circuits of the selector for the vertical operation thereof. The toll operator may now operate the dial of her calling device S in accordance with the second digit in the number of the subscriber at substation A. The interruptions produced by this 0 eration are repeated by relay 20 and by t e line relay 104 of the repeater D, and cause a series of deenergizations of the line relay 151 of the selector F. The toll second selector F is very similar to the selector E and its operation therefore willnot be described in detail. It will be suflicient to say that the deenergizations of the line relay 151 bring about the operation of the vertical magnet 156 through the medium of which the switch shaft is raised step by step until the wipers -173, inclusive, stand opposite the horizontal level of bank contacts which are terminals of trunk lines leading to the desired group of connector switches. The slow actmg relay 153 is energized in series with the vertical magnet and at the first upward step of the shaft closes the initial energizing airs, cuit of the stepping relay 154 by we of the off normal contact springs 159. T e step-f; ping relay 154 locks itself as usual and pre Q pares a circuit for the rotary magnet 157'. m. At the end of the vertical movement of the switch, the slow acting relay 153 is deenergized and-the switch wipers are rotated in search of an idle trunk line by means of the rotary magnet 157, which is controlled by 75 the ste ing relay 154 and the test wiper 171. 1% enan idle trunk line is reached, which we will assume to be the trunk line comprisin conductors'178-181,inclusive,tbe rotation o the switch will cease, leaving 'the so wipers 170-17 3, inclusive, in engagement with bank contacts 174-177, inclusive. The switching relay 150 is now energized and at its armatures 161 and 163 connects the talking conductors 141 and 145 with the line 85 wipers 170 and 173, respectively. Relay'150 also extends conductors 142 and 143 by way of its armatures 162 and 160, wipers 171 and 172, and bank contacts 175 and 176 to conductors 179 and 180. The conductor 143 is 00 included in the control circuit of the toll -se lector F, and when it is extended as above mentioned, the line relay 151 and the release relay 152 of the selector are oi course deen ergized, the selector being maintained in op-ee erated position by the continued energizetion of the switching relay 150, which is supplied with' ground over the conductor 144 coming frbm there eater D;

The switch eontro circuit tended, as above stated, to the conductor- 180 it may be further traced by way of the said conductor 180, the 11' per winding of the relay 204 of the combination connector H, Fig. 4,-contaet springs controlled by the 05 back bridge relay 200, and the upper winding of the line relay 201 to battery. Upon the extension of the control circuit over the above path, the line relay 201 is energized and completes a circuit for the slow acting 1m release relay 202, which at its armature 216 pre ares the connector for vertical operation in t e usual manner. At its upper armature 218, relay 202 connects groun G with the release trunk conductor 305, which condue- 11-3 tor extends to and is multi' led-in the banks of the second"solectors o the regular-"exchange trunking" system which have acess to the combination tolland regular' conne'c tor H. .Conduetor 305 is the release trunk 12aconductor of the trunk line comprising .con-f doctors 304, 305, and 306, whichterminawin. bank contacte301, 302, and 303 respectively, Fig. 3. These bank contacts-are assumed to be located in the banks of one of theregular 125 1 selectors referred to, and the groundpotential upon conductor 305, and thete'steontact 302 and its multiples, renders theeonneetor v v having been exlee from junction point/306" by way 01'' con- (luctor 305', winding of relay 207, left hand winding of the induction 'coil R conductor 179, bank contact 175, wiper 171, armature 162 and its working contact, conductor 142, armature 128 and its working contact, lower winding of the induction coil R armature 119 and its resting contact, and the resistance 111 to battery. B currcnt'fiow over the above circuit the re ay 207 is energized and at its armaturcs 236 and 237 prepares circuits for the ring cut off relay 205 which will be explained later.- Relay 207 also closes a circuit for the switching relay 204 by means of its armature 238, and the latter relay upon energizing produces a number of 1 circuit changes in the connector which are mitted to the line relay 201, the relay brought about for the purpose of enabling it to function as a toll connector rather, than regular connector. These circuit changes include the opening of the perma nent locking circuit of the rin cut off relay 205 at armature 225. the shifting of the locking circuit of the busy test relay 206 at armature 224, the disconnection of the regular truck line conductors 304 and 306 at armatures 223 and 226, and the preparation of a busy signalling circuit for the toll operator at armature 223. These circtiit changes and the results effected therebywill be mentioned more in detail hereinafter. Before proceeding further with the explanation a few more details concerning relays 207 and 204 may be inserted with" benefit.

Relay 207 is of relatively low resistance, and the circuit traced through its winding from the grounded conductor 305 to the conductor 179. and test contact 175, places a potential upon the said test contact 175 and its multiples which is sufiiciently near to ground potential to render the connector H busy to the toll second selectors. With regard to relay 204, the upper winding of this relay, which is included in the circuit of line relay 201,- is of low resistance and is not necessarily strong enough to energize the relay by itself, but is strong enough to hold the said relay in operated position after it has been completely operated by the closure of the circuit through its lower winding. In order to reduce the impedance of the upper winding so as not to interfere with operating impulses trans- 204 is provided with a copper slug as indlca-ted in the drawing.

The connector H is now ready to be operated under the control of the calling device S, when the dial is actuated in accordance with the next digit in thenuniber ot the subscriber at the substation A, A series of interruptions is produced as before, which are repeated by the relays "20 and 104 to bring about a series of deenergizations of the line relay 201. At each deensprings 222 and 220, winding of the slow acting series relay 203, and winding of the vertical magnet 210 to battery. This is the circuit over which the first impulse is transmitted. At the first upward step of the switch shaft, however, the off normal springs are shifted, and the circuit extends from the working contact of armature 216 by way of off normal sprin s 222 and 221, armature 217 and its working contact, relay 203 being new energized), winding 0' the relay 203, and the winding of the vertical magnet 210 to battery. By the operation of the vertical magnet the switch shaft is raised step by step until the wipers 270-272, inclusive, stand opposite the level of bank contacts in which the line of substation A is terminated. The slow acting relay 203 which is energized in series with the vertical magnet, maintains its armature attracted throughout the vertical operation of the switch. when this relay energizes at the beginning of the vertical movement it closes the following circuit for the ring cut-off re lay 205: ground at G", armature 218 and its working contact, armature 219 and its working contact, working contact of armature 237 and the said armature, and the lower winding of the ring cut off relay 205 to battery. Upon energizing, relay 205 opens contacts included in a later established signalling circuit at its armatures 227 and 229,

and at its armature 228 establishes a locking circuit for itself as follows: grounded conductor 305, working contact of armature 228 and the said armature, armature 236 and its working contact, and the lower.

At the winding of relay 205 to battery. end of the vertical movement of the switch, the slow acting relay 203 deenergizes and prepares the connector for operation in its rotary movement.

The toll operator may now operate the dial of the calling device S in accordance with the final digit inthe number-of-thesubscriber at substation A. The interrup-v at G, armature 215 and its resting contact,

armature 216 and its working contact, oft normal springs 222 and 221, armature 217 and its resting contact, resting contact of armature 233 and the said armature, armature 246 and its,resting contact, and the winding of the rotary magnet 212 to battery. In

its"

response to these impulses the rotary magnet operates to rotate the wipers 270-272, inclusive, into engagement with the particular set of bank contacts in which the line of substation A terminates, these bank contacts being the contacts indicated in the drawing by the reference characters 273, 274, and 275. The slow acting relay 208 is ener ed in arallel with the rotary magnet an retains its armatures attracted throughout the rotary movement of the switch. 'At its armature 239, relay 208 connects the test wiper 271 to the winding of the busy test relay 206, and at its armature 240 rela 208 closes a shunt around armature 233 o relay 206 and its restin contact to guard against the possibilit 0 the said relay being momentarily energized while the test wiper 271 is passing over busy test contacts. In order to afford an opportunity to explain the operation of the bus test circuits it will be assumed that when the line of substationA is called at this time it is busy. In such case the test contact 274 will be grounded and when the test wiper 271 makes connection with the said test contact, the test relay 206 will be energized, the circuit being traceable as follows: grounded test contact 274; test-wiper 271, contact springs controlled by armature 244, of relay 209, armature 239 and its working contact, armature 243 and its resting contact, and the winding of the test relay 206 to batter The test relay is energized over the a ove circuit and when the slow acting relay 208 deenergizes at the end of the rotary movement of the switch, the test relay becomes locked up by means of the following circuit: grounded test contact 274, test wiper 271, working contact of armature 224 and the said armature, working contact of armature 230 and the said armature, contact springs controlled by armature 239 of relay 208, armature 243 and its resfing contact, and the winding of the test relay 206 to battery. The various circuit changes eti'ected by the operation of the test relay will now be briefly pointed out. Its locking circuit which is closed at armature 230 has just been explained. At armature 231-the circuit of the switching relay 209iis opened, at armature 232 a shunt is connecte around the armature 236 of relay 207 and its working contact in order to prevent accidental deenergization of the ring cut off relay 205 (by movement of ringing 'key at the operators cord circuit) at armature 233 the circuit of the rotary magnet 212 is opened in order to prevent the switch wipers from being rotated off the contacts of the called line, and at armature 235 alead from the busy signalling machine Q is connect-ed to the lower line conductor 181. The conductor 181 extends back through the selector F, to the lower right hand winding of the repeating coil .R, and it follows that the toll operator will be given an audible busy signal indicating to her that the called line is busy. is similar to methods in common use, and will be understood without further explanation. The operator is also given a visual flash busy signal in the following manner:

When the test relay 206 is energized a circuit is completed which extends from ground by way of the interrupter I, switch P resistance 269, resting contact of armature 241 and the said armature, armature 234 and its working contact, and the working contact of armature 223 and the said armature to the upper line conductor 178, whence the circuit may be traced over the upper conductor of the talkin circuit back to the up 1" right hand win ing of the repeating coi R, and through this winding and the wind' batte feed rela 100 to battery. The circuit a ove trace is intermittently opened and closed by means of the interrupter I, and it follows that the 'rela 100 will be intermittently energized and eenergized. By this operation of the relay 10 batter and ground are intermittently disconnected from the trunk conductors 78 and 80, causi an intermittent operation of the supervisory. relay 3 at the-operators cord circuit. This gives the o rater a visual busy signal. If 29 it IS desire to' depend solely on the audihi busy signal, the switch P may beset so that" the interrupter I is cut out of, the. circnit,

thereby "providing for the permanent extinguishingcf the supervisory lamp'when 81':

line -is called, and in the case of the cor circuit 0, shown herein, this mi ht well be done because the calling device ey and.

the listeningkey are combined in one Stl'llC-- ture, and when the operator finishes dialling a number her head set is necessarily cut .3 across the trunk circuit in readiness to receive an audible busy signal. However, estt s of cord circuits have separate. calling evice keys-so that the operators can tain ty dial numbers and set up connections while This busy signalling'operation of the talking on other circuits and in such cases" l the busy flash signal is-of great utility; and

it is of considerable value even in the present system, because it is a constant reminder .to the operator that she has a connection up on a bus line, and thus removes the possibility of or confusing the connection with an answered call:

To proceed with the explanation, the toll o eraior will now restore her listening key I and may proceed to work on other connections while waiting for the line of substation A to become idle first, however, operating the cut off key in her cord circuit in order to prevent the busy tone from passing out over the toll line. Or she may withdraw the plug from the jack J if she A becomes idle, ground potential is removed the tone test signalling machine Q tobatfrom the test contact 274 and the locking circuit of the test relay 206 is broken. The test relay therefore deenergizes, disconnects the busy signalling machine Q, opens the bus flash signalling circuit, and establishes a circuit for the switching relay 209' which may be traced as follows: rounded conductor 305, armature 231 an its resting contact, upper winding of the switching relay 209, resting contact of armature 239 and the said armature, contact sprin s controlled byarmature 244, test wiper "271, test contact 274, winding of the switching rela 317 of the individual line switch 0; and t e wind ing of the stepping magnet 318 to the com-.

mon bus-bar 319, whence it extends by way of the low resistance secondary winding of tery. Upon the closure of the above circuit relays 209 and 317 are energized in series, and thelatter relay is operated to disconnect the line conductors 320' and 321 from their normal connections in the line switch. Re-. is 317 is not completely 0 erated because of the fact. that the line re ay of the line switch has not been energized and does not connect the line conductors with-the wipers of the line switch. In the connector H, the

rela 209, uponenergizing, opens the circuit of t e rotary magnet 212 at armature 246,

establishes a locking circuit for itself at er.

' ,mature 245, connects. ground "Gr toflle test wiper 271 at armature 2.44, thus closing the circuit of the switching relay 317, o the line switch. over anew path excluding the upper winding of relay 209 which was formerly included in the circuit, and at arma A tures 242 and 247 closes the talking circuit through to the line wipers 270 and 272.

The connection has now been establishedwith the line of substation A. When the busy test relay 206 is deenergized and the connector cuts through on to-the called line as described in the preceding paragraph, the supervisory lam L at'the operators cord circuit stops fias ing and is lighted continuously, thus indicating to the operator that the busy line with which that particular cord circuit is connected has become idle and that the connection thereto has been. completed. The operator will now go in on the line with her listening key in order to listen for the tone test which is associated with the pa station lines. The steppin magnets in t e individual line switches o the paystation lines are supplied with battery through the low resistance secondary winding of the tone test transformer, indicated in Fig. 4, by the reference character Q. Apparatus of this kind is well known and has been used before to indicate to an operator the character of a calling line, a system of this character being shown in the U. S. patent to Bernard D. Willis, No. 1,281,112, granted October 8, 1918. I bedisclosed herein, the tone is transmitted to the operator by means of induction coil R,

induction coil R, and repealin The circuits are not especia need not be traced out in detail. To proceed,

coil ly di 'cult, and!" f: 5 the operator is'advised bythe distinctive- I tone in her receiver that the subscriber whom-f she has called over her tell servicetrunksandwho dcsireda toll connection is a pay? station subscriber and she will know there--.

fore that the call will have to be paid for in" cash and will not be charged.

The next operation is to ring scriber at substation A. For this purpose the operator throws the key K momentarily the subv to ringing position, thereby projecting ring-. 7

ing currentout over the trunk line with which the cord circuit 0 is connected, to-

operate the alternating current relay 101 at repeater D. Upon attracting its, armature 119, relay- 101 breaks the previously described circuit of the relay 207 at the connector H. Belay izes and at its armature 236. breaks the generator Gen. and its own upper wind' There is no especial novelty in the a ling circuit itself, and the ball at S11 a-' 207 accordingly deenexa tion A will be rung automatically as long as;

' the'receiver remains on the hook. During....

the ringing operation the operator isgiyen' the well knoWnfringing current inductionfl' provided of course that she is listening on the. line,"to"notify her that the ringing is proceeding satisfactorily." 'Ihis is. aecom-- P y means at the.. inductive path: 'which extends from armature 247 of relay 209" by way of the low. capacity condenser 299'to the resting contact ot-"armature235. ofrelay 206. Condenser 299 isotyery lowcapacity, perferably about .005.;m1cro' ;far;

cur-

ads, and permits just enough-"ringi rent to leak back in the direction of t e cp I erator to give signal. 1

When the subscriber at substation A removes his receiver in response to the rin ing of his bell the ring out ofi relay 205 wi 1 be her an easily dist nguished-* operated by current from the exchange battery in series with the ringing current generator Gen. or by current from the exchange battery in series with booster battery associated with the generator, and upon attracting its armature 228 will re-establish its former locking circuit, the operator having restored her key by this time to permit the I, I. III

in position,

- now sup the winding of the battery feed relay 100 at ruptedly back through the connector H end "the selector F,

the rela i quest such-person lflcerned'. Assum ng ,tures 227 and 229, respectively,

in'the usual manner-so -;that the right coins have also the" polarized magnet of iiife'onnect'ed "T l-F w r -und the "coins,

sameness energization of relay 207. The ring'cut oil relay also disconnects its own upp er winding and the ringing apparatus at its armaand closes the talking conductors at these same armatures.

lied with talking battery through the repeater D. This circuit will not be traced in detail but it will be observed that the lower line conductor extends uninterto the lower right hand winding of the repeating coil R, whence it extends through the resistance 113 i to ground, while the upper line conductor 320 extends back through the connector H and" the selector F to the upper right hand winding of the repeating coil R, from which point it may winding and through the winding of 100 to batter energize by current ow through the transmitter at substation A, andup'on-o crating its armatures 116 and 117 breaks t e. circuit of the supervisory f; relay; 3st the cord circuit, and causes thisrelay to deene'r gize to extinguish 'the v supervisory lan' p L The operator will now come in line againuby throwing hen-key proper person is or coinsto pay for his connection. RWheu the coins are deposited the operator lei-given an audible signal over-.thetelephone circuit been deposited, and the paystat'iontonthe; line in order that the opparties can converse as desired; I

tion hesibeen "successfully completed, and it thereforebecomes the duty" of the operator- ,l "-5 to collect the coin or ,.coins--which hevebeen' deposited in the II paystation mechanism by the subscriber atsubstation A. I In order to collect the coins, the operator actuate; the collect key which is associated with outgoing tollservice 'trunk in use. Bv this The transmitter at substation A is trol circuitirrseri'es .withrela s be traced through the saidltelay 100' I is" f'on t-theq I I 3K in pawnof relay 105;, and after "ascertaininlg th'at"the at the telephone will re to deposit the correct coin-:5 I I I ated position'this relay breaks the lower con- 'ductor of the talkinv circuit at its'ermature 131 and at the i'vo-rk ngcontactiot. this arrow of '-'the electropolurized relay 106, in its'o erthat she will know thereatteneither, collector r e-" I gin,=etlea ;st so. iarcs the confne'ction tdth'e' party-at substation A is eon I that the. desired-ipnrtyf hascheen obtained-inthe. distant exchange,

the operator will nowflcomplete the connec-. ,figtinnnt her cord circuit and' the connecte Itzwill beassumed new that the'c 'n-veisa'r of current therein is considerably augment ed, and the marginal relay 109 at the repeater D, which heretofore has remained inoperative, ing its armature 13S, relay 109 completes circuits for the same'time, =at its arrnature 137, removes the shorticircuit around the lower windings of these two relays,'w ith the result that the I the con- I I 109 and 10 1. *"iIhQj-HQPQI polarizing Win ings of relays 106 and'107, and,tlie lower windings of aid lower win clingsare inserted in ;these-relays',flare so wound as regards their is now energized: Upon attract the polarizing windings of the electropolarized relays 106 and 107, and at I relative" directions that with battery 13 con- *iiected' in-the circuit, relay 106 will be operuted while releyflO'I will not be'operated.

Upou attract-ing'i-ts armature .130, relay 106 {closes acircui-t ior, the slow vacting relay 110, which upon .e'nergizi'n opens the upper --,conductor of thetnlking circuit'at itsarma- 'jture' i38,' a11d fat o -matures 139 and 140 closes connect-ions which-erethe's'ame as the 'icomiectionsjclose'd by ormatures 128and 129 incerelay 105 is notdeener- I I gized at this one these latter pperations are no iimportance just now.; Returning to ture connects the high -voltagef battery B with the lower line conductor 145. Bat

tery' B is similar to battery'B, and in case be the same battery. Curmay be traced I its" working contact, wiperl73, ban-k contact tn-meture.;229 end thesai'd armature, worlxing. contact "of armature" 247 1fnnd..the said ducto'r 321, the-W n paystation jmechanisru"*=g.to 1; ground.

the linei-ofvsuhs tationjA, and

the proper direction tocollject'whatever coins may have At repeater D 13 is energized and connects'thelow rearniatu're, wiper 272','bsnk contact 275, coni the repeater and tollboardarejn the same i sxchaifigeit-may I 7 rent now flows fromthe-battery B through I 'the right hand winding of relay 115, tothe lower'line conductor'145,1whence the circuit bywayferinature- ISS'and e :iia l77,line conductor' 181, working,. contact of its of'r-the' polarizedl. iiiagnetof the been deposited, hum same time disconnecting itself from the-line circuits,- the'relay 115, whose right hand Winding is in series with: thebettery j lz l' sistance 199 in multiple with resistance 112;; Whenever relay 26 or relay '27, Fig. 1, is

energized the upper talking circuit conductor is connected by way of the marginal relay 28 to ground. A circuit may now be traced for this relay 28 which extends from its grounded terminal through its winding and by way of armature 31 and its working contact, conductor 61, wiper 70, bank contact 74, conductor 7 8, upper left hand winding of repeating coil R, and the resistances 112 and 199 in parallel to battery. The current flow over the above circuit is sufficient to energize relay 28, which thereupon closes the circuit of the collect and refund supervisory lamp L The lighting of lamp L at this time indicates to the operator that one or more coins were actually deposited and are bein collected. If no coins had been deposite when the operator actuated her key and connected battery B to the line of substation A, there would have been no circuit closed for the said battery by way of the polarized magnet at substation A, no flow of current would have taken place, relays 115 and 28 would not have energized, and the lamp L would not have been lighted. The lighting of the lamp, therefore, notifies the operator that she is actually collecting a coin. Having noticed the lighting of lamp L the operator will now restore her collect key momentarily, thus permitting all the circuits having to do with the collection of the coin to restore to their normal position. The operator will now operate her collect key once more momentarily in order to make sure that the coin has been collected. If so, the lamp L will not be lighted this time, and being surevby this that the deposited coins have been properly collected, the operator will then pull down the connection.

When the plug is removed from jack J all the automatic switching apparatus invvolved in the connection is released. There is nothing especially new in the releasing operations, so they will only be very briefly described' Upon the removal of the plug from the jack J relays 20 and 21 are deenergized. Relay 21 breaks the holding circuit extending to the toll selector E which is restored to normal through the medium of release magnet 55 upon thedeenergization of the switching relay 50. Relaly 20, upon deenergizing, breaks the contro circuit extending to the line relay 104 of the repeater D, whereupon relays 104 and 105 are deenergized. Relay 105 breaks the holdin circuit extending to the toll second selector which is restored to normal position by its release magnet 155 following the deenergization of switching relay 150. The line relay 104' breaks the control circuit extending to the line relay 201 of the connector H and the said relay 201 and relay 202 are therefore deenergized. The latter rela'v closes the circuit of release magnet 211 w ich operates in the usual manner to restore the connector H to normal, whereupon all the automatic equipment will have been released and made ready for use in subsequent calls.

It will not be necessary to describe in full detail the manner in which the toll operator can refund deposited coins instead of collect them, as the refunding operation is similar to the collecting operation throughout, except that high voltage batteries having their positive poles grounded are used. Thus, assuming that the previously described connection is set up, and the operator desires to refund the deposited coin,

she will operate her refund key. Relay 27 is therefore energized and connects'batter'y B in the control circuit extending to the repeater D. The operations at the repeater are the same as before described except that the same manner as it does when the coins are being collected.

There remains one other feature which will now be considered, when it is believed the explanation will have been completed. This feature has to do with an auxiliary coin 'collectin arrangement which has'the function of co lecting an deposited coins in case the operator shoul to collect them. As has been explained before, the operator is supposed to either 'collect or refund whatever coins have been depositedbefore she releases the connection ut she may forget to do so some times. In order to take care of this contingency, means is provided in the repeater D which is effective during the release of a successful connection to connect the battery B with the connected subscribers line and thereby collect any coins which remain undisposed of. This automatic collecting operation only. takes place in case a connection has been established which has been answered; in other words, if the local subscriber connected with over the toll service trunks does not answer his telephone, the automatic collect'mechanism is not required and is not operated. Let'it be assumed that the previousl described connection is in the process of ing released and that-the operator has not col lectcd the deposited coins. Since the subscriber at substation A has answered his telephone relay 103 will have been energized forget or neglect;

and the polarized magnet at the subwhen the battery feed relay 100 was operated, being locked to the grounded conductor 144 by way of armature 134 of relay armature 139 holds the circuit of relay 207 108. Now when the relays 104 and 105 of the repeater D are deenergized during the releasing operation circuits are completed by way of armatures 123 and 125 of relay 103 for the relays 110 and 108 respectively. Relay 110 maintains ground on conductor 144 to prevent the release of the toll second selectoi- Fat its armature 1410, and at its of the connector closed in order to prevent the deenergization of the ring out off relay 205 for the time being; while relay 103 maintains the operating circuit of the connector closed at its armature 122 in order to prevent the connector from releasing. Relays 103 and 110 together therefore serve to maintain the connection intact while the relay 108 is operating to perform the collecting operation. This is done at its arniature 135 which serves to connect battery B to conductor 145 the same as in the case where the electro-polarized relay 106 was energized. Relay 108 also breaks the locking circuit of rclay 103-211; its armature 134.

Upon deenergizing, relay 103 breaks the circuit of relays 108 and 110. When relays 103 and 110 deenergize the release'of the connection, which has been suspended, s continued and the remaining apparatus 15 restored to normal as previously described.

Having described my invention what I consider to be new and desire to have 'protected by Letters'Patent will be pointed out in the appended claims.

What I claim as my invention is:

1. In a telephone system, a toll line, a toll opcrators switchboard, a subscribers telephone line, means whereby a toll operator can establish a talking circuit between said lines, said means comprising serially related automat c" switches, a trunk conductor separate from the talking circuit for controlling the setting of said switches, pays-tation mechanism at the subscribers station, and means controlled by the toll operator over said conductor for collecting or refunding deposited coins.

2. In a telephone system, a toll line, a toll operators switchboard, a subscribers telephone line, means whereby atoll operator can establish a talking circuit between said lines, said means comprising serially related automatic switches, an'inductive ,connection included in said talking circuit, paystation mechanism atthe subscribers station, and means controlled by the toll operator over a non-talking conductor on one side of said inductive connection for. collecting" or refunding deposited coins over a talking con- 5 ductor on the other side of said-inductive connection. a

3. In a telephone system, a toll line, atoll operators switchboard, a'subscribers telephone line, means whereby a toll operator automatic switches, a repeating coil dividing said talking circuit into two inductively connected sections, one section comprising continuous metallic talking conductors extending from said coil to said telephone line, paystation mechanism at the subscribers station, and means in said repeater for controlling said mechanism to collect or refund deposited coins,

4. In a telephone system, a toll line, a. toll operators switchboard, a subscribers telephone line, means whereby a toll operator can establish a talking circuit between said lines, said means comprising serially related automatic switches, a repeating coil dividing said talking circuit into two induc/ tively connected sections, one sectioncomprising continuous metallic talking conductors extending from said coil .to said telephone line, paystation mechanism at the subscribers stat ion,dcvices in said repeater,

for controlling said mechanism to collect or refund deposited coins, and means whereby the operator can control said devices.-

6. In a telephone system, atoll line and i a subscribers telephone line, means comprising an'operators cord circuit and a system of toll service trunks for connecting said lines, a repeater. a selector switch, and a connector switch, all included in said trunking system, paystation mechanism at the station on said telephone line, and means whereby the operator can collector .7. In a telephone. system, a toll lineand a s'ubscribers telephoneline, means comprising an operators cord circuit and a system of toll service trunks for connectm said lines, a repeater, a selector switch, an a, connector switch, all included in said in said repeater for controlling said mechanism to collect or refund deposited coins, and means whereby the operator can con trol said devices.

through said connector pay for the refund coins deposited in said mechanism to pay for the connection.

trunking system, paystation mechanismat the station; on said telephoneline, devices- 8.1n a telePhoiic j temy a subscribers.

telephone line, a trunk line. terminating in a repeater, means including a selector and connector switch for connecting said trunk line through the said repeater to the said telephone line, means in said repeater for supplying talking current to the telephone on said line, paystation equi ment at said telephone, and means in sai repeater -for controlling said paystation equipment to collect or refund deposited coins.

9. In a telephone system, a subscribers line, a toll operators switchboard, a toll service trunking system comprising selector and connector switches, means for establishing a complete metallic talking circuitextending through serially related selector and connector switches in said system to the station on said line, paystation mechanism at the said station and means controlled by an operator for collecting and refunding coins deposited in said mechanism.

10. In a telephone system, a subscribers line, a toll service trunking system comprising a trunk line and selector and connector switches, means for operating certain of said switches over a conductor of said trunk line separate from the talking, conductors to extend a connection to said line, and means operated over said conductor to collect or refund deposited coins.

" 11. In a telephone system, a subscribers line, a toll service trunking system coinpris ing repeaters and selector and. connector switches, an operators switchboard, a calling device at said board for operating certain of said switches to establish a complete metallic talking circuit extending from one of said repeaters through the operated selector .zndconnector switchcsto the said line.

stationmechanism at the station on said line," and means in the connected repeater for controlling said mechanism to collect or refund deposited coins. i

13. In a telephone system, a 'subscribers line, a toll service trunking system coinprising repeaters and selector and connector switches, means for operating certain of said switches to establish a complete metallic talking circuit extending from one of said repeaters through the operated selector and connector switches to the said line, aysta tion mechanism at the station on said line, sources of high voltage current of opposite polarities, and means in the connected repeater for applying either of said sources to a conductor of said talking circuit to control said mechanism.

14. In a telephone system, a subscribers line, a toll service trunking system comprising repeaters and selector and connector switches, means for operating certain of said switches to establish a complete metallic talking circuit extending from one of said re-- peaters through the operated selector and connector switches to the said line, paystation mechanism at the station on said line, sources of high voltage current of opposite polarities, means in the connected repeater for applying either of said sources to a connism at the subscribers station, means con-' trolled by the operator for ctllecting or refunding deposited coins, and a signal at the operators position for giving the operator supervision over the collecting and refunding operations.

16. In a telephone system, a toll line and a subscribe-rs telephone line, means comprisiug an operators cord circuit and a system of toll service .trunks for connecting said lines, a selector and a connector switch included in said trunking system, paystation mechanism'at the station on said telephone line, means whereby theoperator can collect e or refund coins deposited in said mechanism to pay for the Connectionyand a signal at the operators'position for givingthe operator supervision over the collecting and refunding operations.

1 17. In atelephon'e system, a toll line and a subscribers telephone line, means comprising'an operators cord circuit and a system of toll service trunks for connecting said lines, a repeater, a selector switch, and a connector switchfall included in said trunking'systelm' paystation mechanism at the stationion saidtelephone line, means whereby the operatorv "can collect orrefund coins deposited in said mechanism to pay for the connection; and a s gnal at the .operatorsposition forgiving the operatorsupervision over the collecting and refunding operations,

18. In a telephonev system, a toll' line, a

subscribcrs telephone line. a toll operators switchboard,,means whereby a toll operator can establish a talking circuit between said lines, said means comprising serially related automatic switches, paystation mechanism at the subscribers station, means controlled by the toll operator for collecting or refunding deposited coins, and automatic means for collecting deposited coins in case the operator forgets to do so.

19. In a telephone system, a toll line, a subscribers telephone line, a toll operators switch board, means whereby a tol operator can establish a talking circuit between said lines, said means comprising serially related automatic switches, an inductive connection included in said talking circuit, paystation mechanism at the subscribers sta-' tion, means controlled by the toll operator for collecting or refiindin deposited coins, and automatic means for co lecting deposited coins in case the operator forgets to do so. 20. In a telephone system, a toll line and a subscribers telephone line, an operators switchboard, means comprising an o erators cord circuit and a system of tol service trunks for connecting .said lines, a selector and a connector switch included in said trunking system, paystation mechanism at the station on said telephone line, means whereby the operator can collect or refund coins deposited in said mechanism to pay for the connection, means for releasing the connection at the end of the conversation, and automatic means for collecting deposited coins in case the operator has neg- .lected to collect them.

21, In a telephone system, a subscribers telephone line, an operators switchboard, means comprising an operators cord. circuit and a system oftoll service trunks for connecting said lines, a repeater, a selector switch, and a connector switch, all included in said trunking system, paystation mechanism at the station on said telephone line, means whereby the operator can collect or refund coins deposited'in said mechanism to pay for the connection, means for releasing the connection at the end of the conversation, and automatic means for collecting deposited coins in case the operator has neglected to collect them.

.22. In a telephone system, a subscribers line, a toll operators switchboard, a toll service trunking system comprising selector and connector switches, means for establishin a talking circuit includin continuous metal ic conductors extending through serially related selector and connector switches in said system to the station on said line, paystation mechanism at the said station,

-means controlled by an operator for collecting and refunding coins deposited in said mechanism, and automatic means for. collecting deposite'l coins in case the operator forgets to do so.

23. In a telephone system, a 'siibscribers telephone line, a repeater, a trunk line terminating in said repeater, means including a selector and connector switch for connecting said trunk line through the said repeater a toll line and I to.the said telephone line, means in said repeater for supplying talking current to the telephone on said line, paystation uipment at said telephone, means in sa'i repeater for controlling said paystation equipment to collect or refund deposited coins, means for releasing said switches, and means operated automatically when the release is initated to actuate the said coin collection controlling means in said repeater.

2-1. In a telephone system, a toll line, a s'ubscrilicrs line, means for completing a talking connection between said lines, said means including a final connector switch having access to said subscribers line, paystation mechanism at the station on said su scribers line, means for releasing said connection, and means operated automatically when the release is initiated for collecting coins deposited in said mechanism to pay for the said connection.

25. In a telephone system, a toll line, a subscribers line, an operators switchboard, means wherein a toll operator can establish a talking connection between said lines, said means including a first selector, a repeater,

a second selector and a connector in serial relation, a repeating coil dividing said talkmg connection into two inductively related sect-ions, pay-station mechanism at the subscribers station, and means in said repeater for controlling said mechanism to collect or refund deposited coins.

26. In a toll service trunking system, an operators position, a plurality of serially related automatic switches controllable from said operators position to extend a connection to a subscribers line, a coin collecting mechanism associated with said subscribers a line. means controllable from said operators position for controlling the operation of said mechanism, and means independent of said operator controlled means for causing the operation of said mechanism.

27. In a telephone system, a toll line, a

suhscribers line, means for setting up a talking connection from said toll line to said subscribers line, said means including a final connector switch having access to said subscribers line, pay-station mechanism at the station on said subscribers line, a.-

plurality of means for releasing said connection. and means operated automatically when the release is initiated for collecting deposited coins in said mechanism to pay for the said connection.

28. In a toll service trunking system,v an operators switchboard, operator cont-rolled serially related automatic switches for extending a connection from said switchboard to a paystation line, a combination switch control and paystation control conductor separate from the talking conductors, a relay in series with said conductor for controlling said switches, and other relays in series with said first relay for controlling the collection or refunding of coins deposited in the paycontrolling said switches, and two polarized relays also controlled over said conductor for collecting or refunding coins deposited in the paystation on said line.

30. In a toll service trunking system, an operators switchboard, operator controlled serially related automatic switches for extending a connection from said, switchboard to a paystation line, a combination switch control and paystation control conductor se arate from the talking conductors, a line iel ay controlled over said conductor for controlling said switches, two polarized relays also controlledover said conductor for collecting or refunding coins deposited in the paystation on said line, a short circuit maintained around said polarized relays while the line relay is in use,'and a third relay in series with said line relay and said polarized relays for opening said short circuit.

31. In a toll service trunking system, an operators switchboard, operator controlled serially related automatic switches for extending a connection from said switchboard to a paystation line, a combination switch control and paystation control conductor se arate from the talking conductors, a line relhy in series with said conductor, itwo polarized relays in series with said line relay, means for short circuiting said polarized relays while said line relay is being used to control said switches, and means for removing the short circuit to permit the operation of one or the other of said polarized relays to collect or refund acoin deposited in the paystation onsaid line.

32;In. a toll service trunking system, an operators switchboard, operator controlled seriallyrclated 'automatic switches for extending a connection-from said switchboard to a *paystation line, a combination switch control and paystation control conductor separate from the talking conductors, a battery in series with said conductor at one end, a

a line relay at the other end of said conductor responsive tocurrent from said bat-' tery forcontrolling said sw tches, a mar-- ginakr'e ay and a-normally short circuited polarized relay in series with said line relay, said marginal relay nonresponsive to cur rent from said battery, a-high voltagecurrent source and means for substituting it for said battery, to. cause said marginal relay to respond, and means controlled by said marginal relay for opening the shunt around said polar relay to permit the latter relay to-control the disposal of a coin deposited in the paystation on said line.

33. In atoll service trunking system, an operators switchboard, a train of automatic switches for extending a talking connection from said switchboard to a paystation telephone line, a conductor separate from the talking circuit over which said switches are controlled by the operator, a high Volta e source of current, a relay controlled by tile operator for conrecting said source to said conductor at one end thereof, a second high voltage current source, and a relay at the otherend of said conductor energized by current from said first source to connect said second source with said telephone line to dispose of a coin deposited in the paystation.

34. In a toll service trunking system, an operators switchboard, a plurality of trunk lines, means including automatic switches for connecting said trunk lines together in serial relation to extend a connection from said switchboard to a paystation line, relay mechanism for controlling the disposition of a coin deposited in the paystation on said line over a talking conductor of one of said trunk lines, and a circuit including a nontalkin conductor of another of said trunk lines or controlling said relay mechanism from the operators switchboard.

35. In a toll service trunking system, an operators switchboard, a plurality of trunk lines, means including automatic switches for connecting said trunk lines together in serial relation to extend a connection from of high voltage collect and refund currents, relay mechanism for connecting one or the other of said sources to a talking conductor of one of said trunk lines to dispose of a coin deposited in the paystation on said line, other sources of high voltage currents for controlling said relay mechanism, and a circuit including a non-talking conductor of another one of said trunk lines for supplying current from said other sources to 'eflectthe operation of said relay mechanism.

36. In a toll service trunking'system, an

I said switchboard to a paystation line, sources operators'switchboard, a plurality of trunk v lines, means including automatic switches .for connecting said trunk lines together in serial relation to extend a connection from said switchboard to a pay-station line, relay mechanism for controlling the disposition of a .coin deposited in the paystation on said line over a talking conductor of one of said trunk lines, a circuit including a non-talking conductor of another of said trunk lines for controlling said relay mechanism from the operators switchboard, a paystation super- 37. In atollservice trunking system,' a'

.toll operators switchboard, a train of automatic' switches and interconnecting trunle lines for extending a connection trorn s'aid switchboard to a paystation telephone lirie, switching devices at anintermediatc switcliing point in said connection for controlling I; the disposal ofcoins deposited inthep'aystation on said line, a signalat'th'e switchboard for supervising the coin disposingfop-f era'tions, and separate circuits connecting;- said switchboard andjswitching point overi which the switching devices are controlled from the switchboard and the signal is'con trolled'irom the switching point.

. 38. In a toll service trunking systern a toll operators switchboard, a train of autocombinat on with a telephone line, automatic mj'atic switches and interconnecting trunk linesfor extending a; connection'from sa d switchboard to a paystation telephone l ne',f

switching devices at an 1 termediate switchi g oint-in said connection for controlling c l nector, an operators position, a sender thereattor controlling said sw tches to build up the disposal of coins deposited in the paystation on Said line, a signal at the switch-" board for supervising the coin disposing operations, a circuit including a non-talking conductor of'one; of said trunk lines .over

which said switching devices are controlled from said switchboard, and a second circuit including a talking conductor-of the same trunk line over which'the said signal is'c'o'ntrolled from said switching point.

r 39. In a toll service trunking system, a toll 'operators] switchboard, a train of automatic switches and interconnecting trunk lines for extending a connection frolnsaid' switchboard to a paystation telephone line, switching devices at'an intermediate switching ointin said connection for controlling the isposal of coins deposited in the pay-' station on said line, a signal at the. switchboard for supervising the coin disposing operations, separate circuits connecting said switchboard and switching point over which the switching devices are controlled from the switchboard and the signal is controlled from the switching point, a relay at said switching oint for controlling the signal circuit, an a common circuit extending between said switching point and the paystation over which the said relay and paystation are controlled simultaneously.

40. In a telephone exchan e system, the combination with a telephone line, automatic switches including a toll transmission selector, an operators position, a sender thereat for controlling said switches to build up a connection to the called line over said automatic switches, includin said toll selector, a coin collector associated with said line having. a ma net to collect or refund deposited coins, an means controlled by the-operator for selectively operating said magnet.

41. In a telephone exchan e system, the cornbinationwith' a telephone ine, automatic selector circuits including a toll selector circu t, thetalking conductors of which are conductively separated byia repeating coil, a source of current bridged across said con-' ductorsbetween the windings on onesid'e of theilcoil for energizing the transmitter of said jline, an opcrators position, a sender t at for controlling saidswitches to build inection to said line over said autoswitches including saidtoll selector,

coin collector associated j with said line having fas. magnet to collect or refund de- 'posited coins,andimeans "cont-rolled by the foperatoi for' I selectively. operating said magnet-{f 142; In a .tel'ephone exchan e system,' the switches"includin a toll selector having a repeat ng coil an talking battery for ener gizingithe transmitter of the line, and also;

including a combination toll and local conmeans controlled by the operator for causing said magnet to collect or refund deposited coins. I

43. In a telephone exchange system, the combination with a telephone line, automatic switches including a tollselector having arepeating coil andv a source of talking battery for energizing the transmitter of the line, an operatoflsposition, a sender tliereat for controlling said switches to build up a connection to the saidline, a coin collector at the station of said line, a polarized relay at said toll selector beyond said repeating coil,'coin current sources at said selector of opposite polarity, and means at said operators position for operating said polarized relay to apply current from one or the otherof said sources to the magnet of the coin collector to collect or refund deposited coins.

44. In a telephone exchange system, the combination with a telephone line, automatic switches including a toll selector having a repeating coil and a source of talking current for energizing the transmitter of the line, an operators position, a sender thereat for controlling said switches to build up a connection to the line, means for causing the connector to remain on the line it busy and signal the operator of this condition, means controlled by the line becoming idle for the t ng-ofqtjhe line having a magn me controlled by the operator for ,cau gs'aid'inagnet to collect or refund the deli sited coins.

45-In a telephone exchange system, the combination with a telephone line, automatic switches, an operators position, a head set'thereat, a sender for controlling .said switches to build up a connection to said line, a coin collector at the station of the line, means individual to the line for transmitting a tone back to the operator; headset, a coin collector at the called station including a magnet and means controlled by the operator for controlling said magnet to collect or refund deposited coins.

46. In a telephone exchange system, the combination with a telephone line, automatic switches including a toll selector having a repeating coil and source of talking current for energizing the transmitter of the line, an opera-tors position, a head set thereat, a sender thereat controlling said automatic switches to build up a connection to the line, means individual to said line for transmitting tone back to the operators head set, a coin collector at the station having a magnet, and means controlled 'by the operator for causing said magnet to collect or refund deposited coins.

47. In a tele hone exchange system, the

, combination with a telephone line, auto repeating coil matic switches includin a toll' selector having a re eating coil and a source of talking current or energizing the transmitter of the line, and including a combination toll and local connector, an operators position, a head set thereat, a sender thereat for 0011-1 trolling said switches to build up a connection to said line, a local bridge at the connector for feeding current to the line, said bridge being cut off when said connector is seized from said position, means for trans-' mitting tone from the line tothe operators head set, a'coin collector at the station of the line having a magnet, and means controlled by the operator for operating said magnet to collect or refund deposited coins.

' 48. In a telephone exchange system, the combination with telephone lines, automatic switches including a toll selector having a and a source of talking current for energizing the transmitter of the line, an operators position, a head set thereat, a sender thereat for controlling said switches to build up a connection to the line, means for transmitting a tone from the line to the operators head set, sources of current of different polarity at said toll selector, a polarized relay thereat, station of said'line having a polarized magnet, and means controlled by the operator for operating said olarized relay to connect one or the other 0? said sources to the line including a polarized a coin box at the to operate said coin collector magnet collect or refund deposited coins.

49. In a telephone exchange system,- the combination with a telephone line, automatic switches-including a toll selectorha vinga repeating coil and a source of talkingfcui rent to energize theftransm'itter ottheline I i an operators posited coin e for again operating said signal, means 50. In a telephone exchange "system, they combination with a'telephone line, an operators position, a head set thereat, means including automatic switches for extending" said line to said position, means controlled by the operator, including automatic switches, for building up a connection to said line, means individual to said line for transmitting a tone to the operators head set, a coin collector at the substation of the line having a magnet therein, and means controlled by the operator for causing said magnet'to collector refund deposited coins.

' 51. In a telephone system, a calling station and a line therefor extending to a central exchange, paystation equipment at said station elayl ada'pted' to :be trolling thecolconnected "to the jl'ipiif f lection and refuriding}, automatic switches at], 'thelex'chan e controllable from said station for nection to an operators, position, means whereby the operator mayico plete the'co' nection to a called station, current sources of opposite polarity, and means wherebythe operator can connect either the calling sired. I a 52. In a telephone system, al 'substation and a line therefor line to control said relay as ,de-

deposited coins,

extending to afcentral of saidsources to exchange, a toll device including a polarized relay connected to the line sources of current of opposite h the exchange for controlling'the, operation when. calling, polarity at:v

and disconnection of said device, ,aut oma tic switches controlled by the, subscriber atsaid station, and operators equipment cooperatin therewith to extend a vconnection to a called line, and means whereby the operator can connect either of said sources to the calling line to control said toll device as desired. 53. In a telephone system, a substation and a line therefor extending to a central exchang -41- toli device inchidinge polarized relay connected to; the line when calling, sources of currentof" oppositepolarity at R the exchange foncontro'lhng' the operation and di'sconnectionof said mechanism, autonizltic switches controlled by the subscriber 7 fat said station, operators'equipment cooperating therewith to extend a connection to a called line, means whereby the operator can 10 connect either of said sources to the calling I effective to operate: 'tli ef ci evicj'ejf before it'is disconnected;

Signed by me "a t Chice'go Count Illinois, th 3 day fif Merchnlg-wvjI 

